I build a super psycho modulation source on stripboard a while ago. The minor changes I made is that all 6 oscillators are fixed squarewaves. So I cannot switch it to triangle. Also I used a second cd40106 as a led driver instead of the transistors. But the rest is the suggestet components.

So, I realized that when I select only two oscillators on the same frequencie to make some drone sounds the sound switches off. absolutely off. It starts to play again as soon as I change the frequencie of one knob, or I turn on a third oscillator in a different frequencie range.

First thought was that the volume was too loud but it's not. Then I played with the glide-knob so it would actually filter any DC- voltage in the output, but it didnt help.

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